v. t. [ L. demonstratus, p. p. of demonstrare to demonstrate; de- + monstrare to show. See Monster. ]
We can not demonstrate these things so as to show that the contrary often involves a contradiction. Tillotson. [ 1913 Webster ]
adj. having been proved or verified beyond doubt; proved by demonstration. [ WordNet 1.5 ]
n. See Demonstrator. [ 1913 Webster ]